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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package org.apache.tools.ant.taskdefs.optional.depend;
import java.io.IOException;
import java.io.InputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
/**
* A class file iterator which iterates through the contents of a Java jar
* file.
*
*/
public class JarFileIterator implements ClassFileIterator {
/** The jar stream from the jar file being iterated over*/
private ZipInputStream jarStream;
/**
* Construct an iterator over a jar stream
*
* @param stream the basic input stream from which the Jar is received
* @exception IOException if the jar stream cannot be created
*/
public JarFileIterator(InputStream stream) throws IOException {
super();
jarStream = new ZipInputStream(stream);
}
/**
* Get the next ClassFile object from the jar
*
* @return a ClassFile object describing the class from the jar
*/
public ClassFile getNextClassFile() {
ZipEntry jarEntry;
ClassFile nextElement = null;
try {
jarEntry = jarStream.getNextEntry();
while (nextElement == null && jarEntry != null) {
String entryName = jarEntry.getName();
if (!jarEntry.isDirectory() && entryName.endsWith(".class")) {
// create a data input stream from the jar input stream
ClassFile javaClass = new ClassFile();
javaClass.read(jarStream);
nextElement = javaClass;
} else {
jarEntry = jarStream.getNextEntry();
}
}
} catch (IOException e) {
String message = e.getMessage();
String text = e.getClass().getName();
if (message != null) {
text += ": " + message;
}
throw new RuntimeException("Problem reading JAR file: " + text);
}
return nextElement;
}
}
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